The collision occurred opposite the Villa Nova guest house at about 12:40 on Saturday.
Police said that all four people were treated at the scene for their injuries.
Pictured: The collision occurred opposite the Villa Nova guest house on Don Road in St Helier.
Anyone with information is being asked to phone the police on 612612 or contact Crimestoppers anonymously on 0800 555 111 or via their anonymous online form at Crimestoppers-uk.org.
